Rack and pinion focuser with alternate collet for hadley telescope

This is a version of the RP_Focuser_Tight_Inner modified to be compatible with the alternate collet, simply because I liked the collet, already had it printed and did not want to use setscrews to keep the eyepiece in place.

Make sure to sand the sliding surfaces and use some sort of dry lubricant.

Personally I sanded the sliding surfaces using 150 grit and using my fingers I rubbed some graphite powder into the surfaces, so now it operates quite smoothly and with very little play (I may have sanded too much).